Sprint CEO Dan Hesse announced a new fitness-focused smartphone, the Samsung Galaxy S5 Sport, and network upgrades on Monday in Chicago at the Museum of Broadcast Communications.

The rugged follow-up to the Samsung Galaxy S5 will include a heart-rate monitor and will be available nationwide on July 25, Hesse said. The phone will be available in blue and red for $0 down and 24 monthly payments of $27.09, for a total of $650.16.

The S5 Sport will “enrich the Samsung fitness experience even more and bring it to a new level,” Hesse said. Samsung rolled out its latest wearable, the Gear Fit, in April, and the two devices will sync.

Sprint, which took over the U.S Cellular market in Chicago in 2013, partnered with athletic apparel brand Under Armour to develop the new smartphone. Under Armour will open a flagship store at 600 N. Michigan Ave. this year.

A feature set called Sprint Fit Live will offer users direct access from the home screen to Map My Fitness, an app Under Armour acquired last December, as well as Sprint’s own S Health biometric tracking app and digital music service Spotify.

Under Armour will offer Galaxy S5 Sport owners 12 months of free access to the premium MVP version of Map My Fitness. New customers of Sprint’s “Framily” friends and family plan will also receive six months of free Spotify mobile app use.

“Sprint Fit Live helps users that live that healthy lifestyle and those that want to by delivering smart, contextual health content when they need it,” said Under Armour CEO and founder Kevin Plank, who also appeared at the event. The phone comes pre-loaded with athletic imagery from Under Armour as well as inspirational quotes.

Hesse also announced HD Voice, a new level of voice service featuring higher call quality and reduced background noise that launches nationally on Sprint today.

Sprint Chief Network Officer John Saw said the voice and data network underpins the company’s efforts to replicate the customer’s at-home broadband experience on mobile.

“What we’re trying to do with Under Armour and Samsung is to try to pull it all together such that our customers get a seamless experience,” Saw said in an interview. “To enable the experience, you really need a good network.”